1. Mitsubishi Group 4-1 Shibakoen 2-chome Minato-ku. Tokyo, 105 Japan TELEPHONE: 03-433-8251
2. Department of Energy Conversion Engineering Graduate School of Engineering Sciences, Kyushu University Fukuoka, 816, Japan TELEPHONE: 092-573-9611
3. Plasma Physics Laboratory, Kyoto University Gokasho, Uji, 611, Japan TELEPHONE: 0774-32-3111